275/30R24 tire size in inches

A 275/30R24 tire measures

30.5" tall × 10.8" wide

3.25" sidewall on a 24" wheel. 661 revolutions per mile.

275/30R24 means a tire 275 mm wide, with sidewalls 30% as tall as the tire is wide (83 mm), radial construction (R), for a 24 inch wheel.

30.5"24" rim3.2"10.8" wide
275/30R24: 30.5 inches tall, 10.8 inches wide, on a 24 inch rim, drawn to scale

275/30R24 specs

Overall diameter (height)30.50 inches (775 mm)
Section width10.83 inches (275 mm)
Sidewall height3.25 inches (83 mm)
Wheel (rim) diameter24 inches
Circumference95.8 inches (2,433 mm)
Revolutions per mile661
Revolutions per kilometer411
Approximate rim width9.0" to 10.5"
In inches (flotation style)30.5x10.8R24
Aspect ratio30%

Calculated from the size. Real tires differ by brand, model and tread depth, typically by a few tenths of an inch.

Sizes that can replace 275/30R24 on a 24" wheel

These 24" sizes are within 3% of 275/30R24's overall diameter, the range most tire shops treat as interchangeable.

SizeDiameterWidthDifferenceReal speed at 60
325/25R2430.40"12.80"−0.3%59.8 mphCompare
335/25R2430.59"13.19"+0.3%60.2 mphCompare
265/30R2430.26"10.43"−0.8%59.5 mphCompare
285/30R2430.73"11.22"+0.8%60.5 mphCompare
315/25R2430.20"12.40"−1.0%59.4 mphCompare
345/25R2430.79"13.58"+1.0%60.6 mphCompare
255/30R2430.02"10.04"−1.5%59.1 mphCompare
295/30R2430.97"11.61"+1.5%60.9 mphCompare
355/25R2430.99"13.98"+1.6%61.0 mphCompare
305/25R2430.00"12.01"−1.6%59.0 mphCompare
255/35R2431.03"10.04"+1.7%61.0 mphCompare
295/25R2429.81"11.61"−2.3%58.6 mphCompare

Same height on other wheel sizes (plus and minus sizing)

SizeWheelDiameterDifference
245/70R1717"30.50"0.0%Compare
345/35R2121"30.51"0.0%Compare
225/65R1919"30.52"+0.1%Compare
325/45R1919"30.52"+0.1%Compare
265/55R1919"30.48"−0.1%Compare
265/60R1818"30.52"+0.1%Compare
245/75R1616"30.47"−0.1%Compare
285/60R1717"30.46"−0.1%Compare
245/65R1818"30.54"+0.1%Compare
295/45R2020"30.45"−0.1%Compare
335/40R2020"30.55"+0.2%Compare
245/80R1515"30.43"−0.2%Compare

One size up or down

Compare 275/30R24 with another size

With 285/30R24 tires, when your speedometer says 60 mph you are really going

60.5 mph

285/30R24 is +0.24 inches (+0.8%) in overall diameter. That is within the 3% most shops and makers allow.

275/30R24285/30R24Difference%
Overall diameter30.50"30.73"+0.24"+0.8%
Section width10.83"11.22"+0.39"+3.6%
Sidewall height3.25"3.37"+0.12"+3.6%
Circumference95.81"96.55"+0.74"+0.8%
Revolutions per mile661.3656.3−5.1−0.8%

Questions

How tall is a 275/30R24 tire?
A 275/30R24 tire is 30.5 inches tall (775 mm), calculated from the size. It is 10.8 inches wide with 3.2 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
What does 275/30R24 mean?
275/30R24 means a tire 275 mm wide, with sidewalls 30% as tall as the tire is wide (83 mm), radial construction (R), for a 24 inch wheel.
How many revolutions per mile does a 275/30R24 tire make?
About 661 revolutions per mile, based on a circumference of 95.8 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
What rim width fits a 275/30R24 tire?
Roughly 9.0" to 10.5". Check the tire maker's approved rim range for the exact model before buying wheels.
Can I use 325/25R24 instead of 275/30R24?
325/25R24 is −0.10 inches (−0.3%) in overall diameter, so at an indicated 60 mph you would be doing 59.8 mph. Differences under 3% are usually fine, but check clearance, load index and your vehicle's placard.

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